Drill-holder.



J M. CALDERWOOD.

1111111 HoLDEm APPLICATION FILED AUG. IU, 1918.

1,296,918. Patented Mar. 11,1919.

2 SHEETS-SHEET I.

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J. M. CLDERWOOD.

DRILL HOLDER.

APPLICATION Flu-:n AuG.1o. i918.

Patented Mar. 11,1919. z'sHEssHEET 2. A

. STES XCR@ TOI-IN 1VI. CALDERWOOD, OF 4SPANISH FORK, UTAH.

DRILL-HOLDER.

Application led August 10, 1918. Serial No. 249,231.

To all whom t may concern.'

Be it known that I, JOHN M. CALDnRwooD, a citizen of the United States, residing at Spanish Fork, in the county of Utah and State of Utah, have invented certain new and useful Improvements in Drill-Holders, of which the following is a specification.

This invention relates to drill holders and embodies improvements on the drill holder set 'forth in my application Serial No. 227758 filed April 10, 1918.

My. object is to provide improved means for automatically turning and retracting the drill so that the cuttings can be removed from the drill hole andthe point of the drill positioned for the neXt stroke of the hammer; further, to greatly lighten the work of drillingandto double the capacity of the machine, enabling one man to do the work heretofore requiring the labor of two men; still further, to provide a drill holder and hammer arranged and adapted so that, instead of being suspended, as usual, they may be inverted and an over-strikev obtained, enabling the driller to make a hole which is horizontal, and upper, or a downward hole, or a hole at any desired angle between 45 deg. upwardly slanting to 45 degrees downwardly slanting, thereby. insuring a successful break of the drilled substance when the round of shots is set off. f

Another object is to provide a drill holder having a spring-actuated hammer, whereby the operator simply pulls the hammer back against the spring action and then releases it, the blow being due to the spring action. This feature of the invention may be used whether the drill holder and hammer are suspended or arranged in raised, or inverted position. I do not limit myself to the particular form of spring means used for this purpose but-have illustrated two forms of springs which may be employed.

Oney embodiment of the invention is set forth hereinafter and shown in the accompanying drawings, and, in the spring actuation, two forms are shown. It is to be understood, however, that'modifications may be resorted to within the spirit and scope of the invention. Y

In the accompanying drawings:

Figure 1, is a side elevation;

Fig. 2, is a fragmentary detail view of the l drill carrier and partof the yoke;

Fig 3, is an end viewrof the drill carrier; 1 Fig. 4, is a detail side view of the colar; Fig. 5, is an end view thereof;

Fig. 6, is a detail view of the shaft;

Fig. 7, is a detail .view of the pinion, pawl, and ratchet and the rack;

Fig. 8, is a side elevation with the parts arranged for an overstrike;

Fig. 9,1is a detail view of the bracket for the draw plate;

Fig. 10, is a detail of a modied spring means; l

Figs. 11, and 12, plan and section of the draw plate; i

Fig. 13, a section on line 13-13, Fig. 11.

The standard 1 and its foot-piece and upper-end construction maybe of any preferred construction, as also the Outrigger arm 2 and the slidable carrier 3 which has the different bolt holes 4 for the accommodation of the bolts 5 and 6 which, respectively, form the pivots for the drill support 7 and the Sledge or hammer 8.

Suspended from thev drill support 7 is a yoke 9 having a shaft bearing 10, inturned ends 11, and sockets 12 provided with clamping or set screws 13. The drill carrier 14 comprises two semi-tubular parts hinged together at 15 and adapted to be fastened together, into tubular form, by suitable, releasable, means 16. The interior of the drill-carrier 14 is of a form, polygonal for instance, adapting it to Vhold the drill 17 to permit the latter to slide therethrough without turning linside the carrier. The chambered ends of the drill carrier loosely receive the inturned ends 11, whereby the drill carrier and the drill are suspended from the yoke 9 and are free to turn on their longitudinal axes, without interfering with the longitudinal movement of the drill within the carrier when it is retracted.

Fitting around the drill and secured thereto by a set screw 19, is a collar 2O comprising halves hinged together at 21 and secured to each other by'a catch 22. This collar has an annular groove 23. A suitably stout, yet properly flexible, leaf spring 24 has one end received within the socket 12 which is nearest the point of the drill and is fastened by the set screw 13 thereof, the remainder of the spring being free. Hinged to the spring jected and to its work and advances it to drilling position when said drill is released Vafter having been retracted and turned, as

will appear hereinafter.

Secured to the drill support 7 1s a bracket i 27. A vertical shaft 28 is journaled in the bearing 10 and has a reduced portion 29 j Ournaled in the bracket 27, whereby the shaft is prevented from shifting up or down. 0n the lower end ofthe shaft 28 is a bevel pinion'30'which meshes with a corresponding pinion 3l formed on the parts of the drill carrier 14. f

Suspended'from the bolt 5 is a bracketI 32 having parallel outstanding parts 33. Slidable between the parts 33 and supported by the lower one of them, is a draw plate 34 having a rack 35 on its edge, meshing with a pinion 36 on the upper end of the shaft 28. The pinion 36 is connected to the shaft 28 by a pawl and ratchet whereby it causes the shaft to turn only when the draw plate 34 is moved to the right, as when the hammer or Sledge is drawn back. When the blow is being delivered, the shaft 28 is not turned.

The draw plate has longitudinal grooves vor ways'37 in its upper face, vertical holes 38 for the rope hereinafter described, and transverse, elongated openings 39 which intersect the holes 38. Secured to the upper face of the draw plate is a pulley or sheave 40.

Slides 41 are adapted to move to and fro inthe grooves or ways 37 and are hinged to arched parts 42 which have hooks 43 detachably engaged with eyes on a collar 44 adjustably secured to the hammer handle. The slides have eyes 45 atv intervals of their length. VLocated at the side of the draw plate is a bar 46 having an eye 47 A bolt 48 passes through the eyes 45 and the eye 47. According` to the point where the bolt 6 is set on the carrier 3, one or another of the sets of eyes 45 will be located at the endV of the draw late and secured to the bar 46 by the bolt 48. his adjustability permits the use of a drill of considerable length and obviates the nei cessity of frequent change in the drilling tool.

Passing through the bar 46 and the openings 39 are bolts 49 which thus have a portion of their lengths intersecting the vertical holes 38. Secured to the bolts 49 are hangers 50. A spool or drum 5l is journaled to said hangers and provided with ratcheted or toothed heads 52. Secured to the draw plate 34 is an arm 53 which is arranged so that when the hangers 50 yare moved to theright with the bolts 49 and slides 41 on the retraction of.y the hammer prior to delivering a blow, the arm 53 engages one ofthe toothed heads 52 and locksthe drum` 51 funtil the hammer swings to the left'to deliif'er the blow, whereupon the drum is shifted to the left with the slides 41 and released from the arm 53.

- A rope 54 extends from an eye 55 on the VV"spring 24 arounda pulley 56 on the yoke 9,

Vare moved to the right.'k The arm 53,v on

the first slight movement of these parts, engages andV locks the drum against rotation, At the saine time, the parts, 0f the bolts 49 which are exposed in the holes ,38, press against the rope 54 and bind Vit so that it cannot move. The rope'is then locked to the-draw plate` 34." The swing of the hammer causes the rope to pull upon the spring24 and thus cause the drill to slide in the carrier 14.v Meanwhile, the Yengagement of theV rack 35 with the pinion `36, causes the shaft 28 to be rotated, thus turning the drill carrier 14 on its longitudinal axis, and with it the drill.r The drill is-thus retraoted,"bringing away the cuttings out of Y the face of the hole, the drill being then arranged for another blow. The use of a drum ,for the rope enables the rope t0 be taken up or let out and the collar 2O to be shifted along the drill, according to the depth of the drilling, lengthY of the drill being used, etc. Vhen the hammer is swung to the left to deliver the blowV on the drill, the bolts 49are released from the rope,'the drum is released from Vthe ar1n'53, andthe spring 24. being then released, forces .the drill into the drill hole. The shaft 28 is not turned because the pinion 36 idles thereon.

My invention contemplates not only the p-articular mechanism heretofore described but, also, the use of spring means for Vactuatingy the hammer to vcause Vit to deliver its blow, after it has been drawn back against such spring. means. This feature is illustrated in Figs. 8 and 10. o

Referring first to Fig. 10, the pivot bolt 6 for the hammer may be provided with Van eye 57. Aspring 58 havingone end secured to the eyer57 and its other end fastened to the hammer handle at 59 is adapted to cause the hammer tofswing toward the drill. A suitable handle 60 fastened to the hammer handle in any desired manner, and adjustable to Vdifferent points of the length thereof if preferred, is intended to 'be grasped by the driller to draw back the hammer to the right; the handle 60 Vis then released and the spring 58 then quicklyV draws the hammer to the left and causes it to deliver a blow on the drill. In Fig. `8, an elongatedV .coil spring 61 serves the same purposeV as the spring 58,130

iro

said spring 61 being fastened to the carrier y 3 at any suitable point as, for instance, to the bolt 5 and also to the handle of the hammer. The hammer handle may be carried by a frame 62 having suitable clips 63 and pivoted to the bolt 6 and provided with a handle 64 and a hook 65 for connection to the spring 61.

Either of the above spring means may be employed in connection with the hammer when it and the drill support 7 are suspended from the carrier 3, as in Fig. l, or when said support and hammer are arranged above the outrigger arm, as in Fig. 8 for overstriling.

As shown in Fig. 8, the drill support 7 and hammer 8 may be arranged above the Outrigger larm for overstriking. When thus arranged, one or the other of the spring means heretofore described, will, preferably, be used, or, some suitable spring actuating means. It is to be understood that when arranged for overstriking, the invention is not limited to the employment of spring actuating means.

The particular advantage of the adaptability of the drill support and hammer for positioning above the Outrigger arm, in inverted arrangement, is that an overstrike may be had, thus producing an upper, Va straight, or a downward hole, especially to enable a hole to be drilled between 45 degrecs upward slant to that of 4:5 degrees downward slant, thereby insuring a successful break of the drilled substance When the round of shots is set off.

What I claim is:

l. In a drill holder, the combination withV a drill support, and a drill carried thereby,

of a hammer for driving the drill, a device for projecting the drill, and a flexible connection which connects the drill projecting device to the hammer for the purpose of retracting said projecting device and the drill by the backward movement of the hammer.

3. In a drill holder, the combination with Y a drill support, and a' drill carried thereby,

of a hammer for driving the drill, a slidable member yoperatively connected to the hammer, a drill projectingdevice, and a flexible member connecting the drill to the slidable member.

4. In a drill holder, the combination with a drill support, and a drill carried thereby, of a hammer for driving the drill, a slida'ble member operatively connected to the hammer, a drill projecting device, a winding drum carried by the slidable member, and a flexible connection between the drum and the drill whereby the drill may be retracted.

5. In a drill holder, the combination with a drill support, and a drill carried thereby, of a hammer for driving the drill, a slidable member, an operative connection between the slidable member and the hammer which has a loose connection with the slidable member, a drum carried by the slidable Y member, a drill projecting device, and a flexible operative connection between the drum and the drill whereby the latter may be retracted, said loose operative connection being adapted to fasten the flexible connection when the hammer is retracted prior to delivering a blow.

6. In a drill holder, the combination with a drill support, and a drill which is carried thereby and arranged to turn on its axis, of a hammer for driving the drill, a slidable member operatively connected to the hammer, said slidable member having a rack, a shaft geared to the drill forthe purpose of turning the latter, and a pinion meshing with said rack which has a pawl and ratchet connection With the shaft, whereby the drill will be rotated on the retraction of the hammer and will idle on the advance of the hammer to deliver its blow.

In testimony whereof I afliX my signature.

JOHN M. CALDERWOOD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

